/*  Copyright Mihai Bazon, 2002-2005  |  www.bazon.net/mishoo
 * -----------------------------------------------------------
 *
 * The DHTML Calendar, version 1.0 "It is happening again"
 *
 * Details and latest version at:
 * www.dynarch.com/projects/calendar
 *
 * This script is developed by Dynarch.com.  Visit us at www.dynarch.com.
 *
 * This script is distributed under the GNU Lesser General Public License.
 * Read the entire license text here: http://www.gnu.org/licenses/lgpl.html
 */

// $Id: calendar.js,v 1.51 2005/03/07 16:44:31 mishoo Exp $

/** The Calendar object constructor. */
Calendar = function (firstDayOfWeek, dateStr, onSelected, onClose) {
        // member variables
        this.activeDiv = null;
        this.currentDateEl = null;
        this.getDateStatus = null;
        this.getDateToolTip = null;
        this.getDateText = null;
        this.timeout = null;
        this.onSelected = onSelected || null;
        this.onClose = onClose || null;
        this.dragging = false;
        this.hidden = false;
        this.minYear = 1970;
        this.maxYear = 2050;
        this.dateFormat = Calendar._TT["DEF_DATE_FORMAT"];
        this.ttDateFormat = Calendar._TT["TT_DATE_FORMAT"];
        this.isPopup = true;
        this.weekNumbers = true;
        this.firstDayOfWeek = typeof firstDayOfWeek == "number" ? firstDayOfWeek : Calendar._FD; // 0 for Sunday, 1 for Monday, etc.
        this.showsOtherMonths = false;
        this.dateStr = dateStr;
        this.ar_days = null;
        this.showsTime = true;
        this.time24 = true;
        this.yearStep = 2;
        this.hiliteToday = true;
        this.multiple = null;
        // HTML elements
        this.table = null;
        this.element = null;
        this.tbody = null;
        this.firstdayname = null;
        // Combo boxes
        this.monthsCombo = null;
        this.yearsCombo = null;
        this.hilitedMonth = null;
        this.activeMonth = null;
        this.hilitedYear = null;
        this.activeYear = null;
        // Information
        this.dateClicked = false;

        // one-time initializations
        if (typeof Calendar._SDN == "undefined") {
                // table of short day names
                if (typeof Calendar._SDN_len == "undefined")
                        Calendar._SDN_len = 3;
                var ar = new Array();
                for (var i = 8; i > 0;) {
                        ar[--i] = Calendar._DN[i].substr(0, Calendar._SDN_len);
                }
                Calendar._SDN = ar;
                // table of short month names
                if (typeof Calendar._SMN_len == "undefined")
                        Calendar._SMN_len = 3;
                ar = new Array();
                for (var i = 12; i > 0;) {
                        ar[--i] = Calendar._MN[i].substr(0, Calendar._SMN_len);
                }
                Calendar._SMN = ar;
        }
};

// ** constants

/// "static", needed for event handlers.
Calendar._C = null;

/// detect a special case of "web browser"
Calendar.is_ie = ( /msie/i.test(navigator.userAgent) &&
                   !/opera/i.test(navigator.userAgent) );

Calendar.is_ie5 = ( Calendar.is_ie && /msie 5\.0/i.test(navigator.userAgent) );

/// detect Opera browser
Calendar.is_opera = /opera/i.test(navigator.userAgent);

/// detect KHTML-based browsers
Calendar.is_khtml = /Konqueror|Safari|KHTML/i.test(navigator.userAgent);

// BEGIN: UTILITY FUNCTIONS; beware that these might be moved into a separate
//        library, at some point.

Calendar.getAbsolutePos = function(el) {
        var SL = 0, ST = 0;
        var is_div = /^div$/i.test(el.tagName);
        if (is_div && el.scrollLeft)
                SL = el.scrollLeft;
        if (is_div && el.scrollTop)
                ST = el.scrollTop;
        var r = { x: el.offsetLeft - SL, y: el.offsetTop - ST };
        if (el.offsetParent) {
                var tmp = this.getAbsolutePos(el.offsetParent);
                r.x += tmp.x;
                r.y += tmp.y;
        }
        return r;
};

Calendar.isRelated = function (el, evt) {
        var related = evt.relatedTarget;
        if (!related) {
                var type = evt.type;
                if (type == "mouseover") {
                        related = evt.fromElement;
                } else if (type == "mouseout") {
                        related = evt.toElement;
                }
        }
        while (related) {
                if (related == el) {
                        return true;
                }
                related = related.parentNode;
        }
        return false;
};

Calendar.removeClass = function(el, className) {
        if (!(el && el.className)) {
                return;
        }
        var cls = el.className.split(" ");
        var ar = new Array();
        for (var i = cls.length; i > 0;) {
                if (cls[--i] != className) {
                        ar[ar.length] = cls[i];
                }
        }
        el.className = ar.join(" ");
};

Calendar.addClass = function(el, className) {
        Calendar.removeClass(el, className);
        el.className += " " + className;
};

// FIXME: the following 2 functions totally suck, are useless and should be replaced immediately.
Calendar.getElement = function(ev) {
        var f = Calendar.is_ie ? window.event.srcElement : ev.currentTarget;
        while (f.nodeType != 1 || /^div$/i.test(f.tagName))
                f = f.parentNode;
        return f;
};

Calendar.getTargetElement = function(ev) {
        var f = Calendar.is_ie ? window.event.srcElement : ev.target;
        while (f.nodeType != 1)
                f = f.parentNode;
        return f;
};

Calendar.stopEvent = function(ev) {
        ev || (ev = window.event);
        if (Calendar.is_ie) {
                ev.cancelBubble = true;
                ev.returnValue = false;
        } else {
                ev.preventDefault();
                ev.stopPropagation();
        }
        return false;
};

Calendar.addEvent = function(el, evname, func) {
        if (el.attachEvent) { // IE
                el.attachEvent("on" + evname, func);
        } else if (el.addEventListener) { // Gecko / W3C
                el.addEventListener(evname, func, true);
        } else {
                el["on" + evname] = func;
        }
};

Calendar.removeEvent = function(el, evname, func) {
        if (el.detachEvent) { // IE
                el.detachEvent("on" + evname, func);
        } else if (el.removeEventListener) { // Gecko / W3C
                el.removeEventListener(evname, func, true);
        } else {
                el["on" + evname] = null;
        }
};

Calendar.createElement = function(type, parent) {
        var el = null;
        if (document.createElementNS) {
                // use the XHTML namespace; IE won't normally get here unless
                // _they_ "fix" the DOM2 implementation.
                el = document.createElementNS("http://www.w3.org/1999/xhtml", type);
        } else {
                el = document.createElement(type);
        }
        if (typeof parent != "undefined") {
                parent.appendChild(el);
        }
        return el;
};

// END: UTILITY FUNCTIONS

// BEGIN: CALENDAR STATIC FUNCTIONS

/** Internal -- adds a set of events to make some element behave like a button. */
Calendar._add_evs = function(el) {
        with (Calendar) {
                addEvent(el, "mouseover", dayMouseOver);
                addEvent(el, "mousedown", dayMouseDown);
                addEvent(el, "mouseout", dayMouseOut);
                if (is_ie) {
                        addEvent(el, "dblclick", dayMouseDblClick);
                        el.setAttribute("unselectable", true);
                }
        }
};

Calendar.findMonth = function(el) {
        if (typeof el.month != "undefined") {
                return el;
        } else if (typeof el.parentNode.month != "undefined") {
                return el.parentNode;
        }
        return null;
};

Calendar.findYear = function(el) {
        if (typeof el.year != "undefined") {
                return el;
        } else if (typeof el.parentNode.year != "undefined") {
                return el.parentNode;
        }
        return null;
};

Calendar.showMonthsCombo = function () {
        var cal = Calendar._C;
        if (!cal) {
                return false;
        }
        var cal = cal;
        var cd = cal.activeDiv;
        var mc = cal.monthsCombo;
        if (cal.hilitedMonth) {
                Calendar.removeClass(cal.hilitedMonth, "hilite");
        }
        if (cal.activeMonth) {
                Calendar.removeClass(cal.activeMonth, "active");
        }
        var mon = cal.monthsCombo.getElementsByTagName("div")[cal.date.getMonth()];
        Calendar.addClass(mon, "active");
        cal.activeMonth = mon;
        var s = mc.style;
        s.display = "block";
        if (cd.navtype < 0)
                s.left = cd.offsetLeft + "px";
        else {
                var mcw = mc.offsetWidth;
                if (typeof mcw == "undefined")
                        // Konqueror brain-dead techniques
                        mcw = 50;
                s.left = (cd.offsetLeft + cd.offsetWidth - mcw) + "px";
        }
        s.top = (cd.offsetTop + cd.offsetHeight) + "px";
};

Calendar.showYearsCombo = function (fwd) {
        var cal = Calendar._C;
        if (!cal) {
                return false;
        }
        var cal = cal;
        var cd = cal.activeDiv;
        var yc = cal.yearsCombo;
        if (cal.hilitedYear) {
                Calendar.removeClass(cal.hilitedYear, "hilite");
        }
        if (cal.activeYear) {
                Calendar.removeClass(cal.activeYear, "active");
        }
        cal.activeYear = null;
        var Y = cal.date.getFullYear() + (fwd ? 1 : -1);
        var yr = yc.firstChild;
        var show = false;
        for (var i = 12; i > 0; --i) {
                if (Y >= cal.minYear && Y <= cal.maxYear) {
                        yr.innerHTML = Y;
                        yr.year = Y;
                        yr.style.display = "block";
                        show = true;
                } else {
                        yr.style.display = "none";
                }
                yr = yr.nextSibling;
                Y += fwd ? cal.yearStep : -cal.yearStep;
        }
        if (show) {
                var s = yc.style;
                s.display = "block";
                if (cd.navtype < 0)
                        s.left = cd.offsetLeft + "px";
                else {
                        var ycw = yc.offsetWidth;
                        if (typeof ycw == "undefined")
                                // Konqueror brain-dead techniques
                                ycw = 50;
                        s.left = (cd.offsetLeft + cd.offsetWidth - ycw) + "px";
                }
                s.top = (cd.offsetTop + cd.offsetHeight) + "px";
        }
};

// event handlers

Calendar.tableMouseUp = function(ev) {
        var cal = Calendar._C;
        if (!cal) {
                return false;
        }
        if (cal.timeout) {
                clearTimeout(cal.timeout);
        }
        var el = cal.activeDiv;
        if (!el) {
                return false;
        }
        var target = Calendar.getTargetElement(ev);
        ev || (ev = window.event);
        Calendar.removeClass(el, "active");
        if (target == el || target.parentNode == el) {
                Calendar.cellClick(el, ev);
        }
        var mon = Calendar.findMonth(target);
        var date = null;
        if (mon) {
                date = new Date(cal.date);
                if (mon.month != date.getMonth()) {
                        date.setMonth(mon.month);
                        cal.setDate(date);
                        cal.dateClicked = false;
                        cal.callHandler();
                }
        } else {
                var year = Calendar.findYear(target);
                if (year) {
                        date = new Date(cal.date);
                        if (year.year != date.getFullYear()) {
                                date.setFullYear(year.year);
                                cal.setDate(date);
                                cal.dateClicked = false;
                                cal.callHandler();
                        }
                }
        }
        with (Calendar) {
                removeEvent(document, "mouseup", tableMouseUp);
                removeEvent(document, "mouseover", tableMouseOver);
                removeEvent(document, "mousemove", tableMouseOver);
                cal._hideCombos();
                _C = null;
                return stopEvent(ev);
        }
};

Calendar.tableMouseOver = function (ev) {
        var cal = Calendar._C;
        if (!cal) {
                return;
        }
        var el = cal.activeDiv;
        var target = Calendar.getTargetElement(ev);
        if (target == el || target.parentNode == el) {
                Calendar.addClass(el, "hilite active");
                Calendar.addClass(el.parentNode, "rowhilite");
        } else {
                if (typeof el.navtype == "undefined" || (el.navtype != 50 && (el.navtype == 0 || Math.abs(el.navtype) > 2)))
                        Calendar.removeClass(el, "active");
                Calendar.removeClass(el, "hilite");
                Calendar.removeClass(el.parentNode, "rowhilite");
        }
        ev || (ev = window.event);
        if (el.navtype == 50 && target != el) {
                var pos = Calendar.getAbsolutePos(el);
                var w = el.offsetWidth;
                var x = ev.clientX;
                var dx;
                var decrease = true;
                if (x > pos.x + w) {
                        dx = x - pos.x - w;
                        decrease = false;
                } else
                        dx = pos.x - x;

                if (dx < 0) dx = 0;
                var range = el._range;
                var current = el._current;
                var count = Math.floor(dx / 10) % range.length;
                for (var i = range.length; --i >= 0;)
                        if (range[i] == current)
                                break;
                while (count-- > 0)
                        if (decrease) {
                                if (--i < 0)
                                        i = range.length - 1;
                        } else if ( ++i >= range.length )
                                i = 0;
                var newval = range[i];
                el.innerHTML = newval;

                cal.onUpdateTime();
        }
        var mon = Calendar.findMonth(target);
        if (mon) {
                if (mon.month != cal.date.getMonth()) {
                        if (cal.hilitedMonth) {
                                Calendar.removeClass(cal.hilitedMonth, "hilite");
                        }
                        Calendar.addClass(mon, "hilite");
                        cal.hilitedMonth = mon;
                } else if (cal.hilitedMonth) {
                        Calendar.removeClass(cal.hilitedMonth, "hilite");
                }
        } else {
                if (cal.hilitedMonth) {
                        Calendar.removeClass(cal.hilitedMonth, "hilite");
                }
                var year = Calendar.findYear(target);
                if (year) {
                        if (year.year != cal.date.getFullYear()) {
                                if (cal.hilitedYear) {
                                        Calendar.removeClass(cal.hilitedYear, "hilite");
                                }
                                Calendar.addClass(year, "hilite");
                                cal.hilitedYear = year;
                        } else if (cal.hilitedYear) {
                                Calendar.removeClass(cal.hilitedYear, "hilite");
                        }
                } else if (cal.hilitedYear) {
                        Calendar.removeClass(cal.hilitedYear, "hilite");
                }
        }
        return Calendar.stopEvent(ev);
};

Calendar.tableMouseDown = function (ev) {
        if (Calendar.getTargetElement(ev) == Calendar.getElement(ev)) {
                return Calendar.stopEvent(ev);
        }
};

Calendar.calDragIt = function (ev) {
        var cal = Calendar._C;
        if (!(cal && cal.dragging)) {
                return false;
        }
        var posX;
        var posY;
        if (Calendar.is_ie) {
                posY = window.event.clientY + document.body.scrollTop;
                posX = window.event.clientX + document.body.scrollLeft;
        } else {
                posX = ev.pageX;
                posY = ev.pageY;
        }
        cal.hideShowCovered();
        var st = cal.element.style;
        st.left = (posX - cal.xOffs) + "px";
        st.top = (posY - cal.yOffs) + "px";
        return Calendar.stopEvent(ev);
};

Calendar.calDragEnd = function (ev) {
        var cal = Calendar._C;
        if (!cal) {
                return false;
        }
        cal.dragging = false;
        with (Calendar) {
                removeEvent(document, "mousemove", calDragIt);
                removeEvent(document, "mouseup", calDragEnd);
                tableMouseUp(ev);
        }
        cal.hideShowCovered();
};

Calendar.dayMouseDown = function(ev) {
        var el = Calendar.getElement(ev);
        if (el.disabled) {
                return false;
        }
        var cal = el.calendar;
        cal.activeDiv = el;
        Calendar._C = cal;
        if (el.navtype != 300) with (Calendar) {
                if (el.navtype == 50) {
                        el._current = el.innerHTML;
                        addEvent(document, "mousemove", tableMouseOver);
                } else
                        addEvent(document, Calendar.is_ie5 ? "mousemove" : "mouseover", tableMouseOver);
                addClass(el, "hilite active");
                addEvent(document, "mouseup", tableMouseUp);
        } else if (cal.isPopup) {
                cal._dragStart(ev);
        }
        if (el.navtype == -1 || el.navtype == 1) {
                if (cal.timeout) clearTimeout(cal.timeout);
                cal.timeout = setTimeout("Calendar.showMonthsCombo()", 250);
        } else if (el.navtype == -2 || el.navtype == 2) {
                if (cal.timeout) clearTimeout(cal.timeout);
                cal.timeout = setTimeout((el.navtype > 0) ? "Calendar.showYearsCombo(true)" : "Calendar.showYearsCombo(false)", 250);
        } else {
                cal.timeout = null;
        }
        return Calendar.stopEvent(ev);
};

Calendar.dayMouseDblClick = function(ev) {
        Calendar.cellClick(Calendar.getElement(ev), ev || window.event);
        if (Calendar.is_ie) {
                document.selection.empty();
        }
};

Calendar.dayMouseOver = function(ev) {
        var el = Calendar.getElement(ev);
        if (Calendar.isRelated(el, ev) || Calendar._C || el.disabled) {
                return false;
        }
        if (el.ttip) {
                if (el.ttip.substr(0, 1) == "_") {
                        el.ttip = el.caldate.print(el.calendar.ttDateFormat) + el.ttip.substr(1);
                }
                el.calendar.tooltips.innerHTML = el.ttip;
        }
        if (el.navtype != 300) {
                Calendar.addClass(el, "hilite");
                if (el.caldate) {
                        Calendar.addClass(el.parentNode, "rowhilite");
                }
        }
        return Calendar.stopEvent(ev);
};

Calendar.dayMouseOut = function(ev) {
        with (Calendar) {
                var el = getElement(ev);
                if (isRelated(el, ev) || _C || el.disabled)
                        return false;
                removeClass(el, "hilite");
                if (el.caldate)
                        removeClass(el.parentNode, "rowhilite");
                if (el.calendar)
                        el.calendar.tooltips.innerHTML = _TT["SEL_DATE"];
                return stopEvent(ev);
        }
};

/**
 *  A generic "click" handler :) handles all types of buttons defined in this
 *  calendar.
 */
Calendar.cellClick = function(el, ev) {
        var cal = el.calendar;
        var closing = false;
        var newdate = false;
        var date = null;
        if (typeof el.navtype == "undefined") {
                if (cal.currentDateEl) {
                        Calendar.removeClass(cal.currentDateEl, "selected");
                        Calendar.addClass(el, "selected");
                        closing = (cal.currentDateEl == el);
                        if (!closing) {
                                cal.currentDateEl = el;
                        }
                }
                cal.date.setDateOnly(el.caldate);
                date = cal.date;
                var other_month = !(cal.dateClicked = !el.otherMonth);
                if (!other_month && !cal.currentDateEl)
                        cal._toggleMultipleDate(new Date(date));
                else
                        newdate = !el.disabled;
                // a date was clicked
                if (other_month)
                        cal._init(cal.firstDayOfWeek, date);
        } else {
                if (el.navtype == 200) {
                        Calendar.removeClass(el, "hilite");
                        cal.callCloseHandler();
                        return;
                }
                date = new Date(cal.date);
                if (el.navtype == 0)
                        date.setDateOnly(new Date()); // TODAY
                // unless "today" was clicked, we assume no date was clicked so
                // the selected handler will know not to close the calenar when
                // in single-click mode.
                // cal.dateClicked = (el.navtype == 0);
                cal.dateClicked = false;
                var year = date.getFullYear();
                var mon = date.getMonth();
                function setMonth(m) {
                        var day = date.getDate();
                        var max = date.getMonthDays(m);
                        if (day > max) {
                                date.setDate(max);
                        }
                        date.setMonth(m);
                };
                switch (el.navtype) {
                    case 400:
                        Calendar.removeClass(el, "hilite");
                        var text = Calendar._TT["ABOUT"];
                        if (typeof text != "undefined") {
                                text += cal.showsTime ? Calendar._TT["ABOUT_TIME"] : "";
                        } else {
                                // FIXME: this should be removed as soon as lang files get updated!
                                text = "Help and about box text is not translated into this language.\n" +
                                        "If you know this language and you feel generous please update\n" +
                                        "the corresponding file in \"lang\" subdir to match calendar-en.js\n" +
                                        "and send it back to <mihai_bazon@yahoo.com> to get it into the distribution  ;-)\n\n" +
                                        "Thank you!\n" +
                                        "http://dynarch.com/mishoo/calendar.epl\n";
                        }
                        alert(text);
                        return;
                    case -2:
                        if (year > cal.minYear) {
                                date.setFullYear(year - 1);
                        }
                        break;
                    case -1:
                        if (mon > 0) {
                                setMonth(mon - 1);
                        } else if (year-- > cal.minYear) {
                                date.setFullYear(year);
                                setMonth(11);
                        }
                        break;
                    case 1:
                        if (mon < 11) {
                                setMonth(mon + 1);
                        } else if (year < cal.maxYear) {
                                date.setFullYear(year + 1);
                                setMonth(0);
                        }
                        break;
                    case 2:
                        if (year < cal.maxYear) {
                                date.setFullYear(year + 1);
                        }
                        break;
                    case 100:
                        cal.setFirstDayOfWeek(el.fdow);
                        return;
                    case 50:
                        var range = el._range;
                        var current = el.innerHTML;
                        for (var i = range.length; --i >= 0;)
                                if (range[i] == current)
                                        break;
                        if (ev && ev.shiftKey) {
                                if (--i < 0)
                                        i = range.length - 1;
                        } else if ( ++i >= range.length )
                                i = 0;
                        var newval = range[i];
                        el.innerHTML = newval;
                        cal.onUpdateTime();
                        return;
                    case 0:
                        // TODAY will bring us here
                        if ((typeof cal.getDateStatus == "function") &&
                            cal.getDateStatus(date, date.getFullYear(), date.getMonth(), date.getDate())) {
                                return false;
                        }
                        break;
                }
                if (!date.equalsTo(cal.date)) {
                        cal.setDate(date);
                        newdate = true;
                } else if (el.navtype == 0)
                        newdate = closing = true;
        }
        if (newdate) {
                ev && cal.callHandler();
        }
        if (closing) {
                Calendar.removeClass(el, "hilite");
                ev && cal.callCloseHandler();
        }
};

// END: CALENDAR STATIC FUNCTIONS

// BEGIN: CALENDAR OBJECT FUNCTIONS

/**
 *  This function creates the calendar inside the given parent.  If _par is
 *  null than it creates a popup calendar inside the BODY element.  If _par is
 *  an element, be it BODY, then it creates a non-popup calendar (still
 *  hidden).  Some properties need to be set before calling this function.
 */
Calendar.prototype.create = function (_par) {
        var parent = null;
        if (! _par) {
                // default parent is the document body, in which case we create
                // a popup calendar.
                parent = document.getElementsByTagName("body")[0];
                this.isPopup = true;
        } else {
                parent = _par;
                this.isPopup = false;
        }
        this.date = this.dateStr ? new Date(this.dateStr) : new Date();

        var table = Calendar.createElement("table");
        this.table = table;
        table.cellSpacing = 0;
        table.cellPadding = 0;
        table.calendar = this;
        Calendar.addEvent(table, "mousedown", Calendar.tableMouseDown);

        var div = Calendar.createElement("div");
        this.element = div;
        div.className = "calendar";
        if (this.isPopup) {
                div.style.position = "absolute";
                div.style.display = "none";
        }
        div.appendChild(table);

        var thead = Calendar.createElement("thead", table);
        var cell = null;
        var row = null;

        var cal = this;
        var hh = function (text, cs, navtype) {
                cell = Calendar.createElement("td", row);
                cell.colSpan = cs;
                cell.className = "button";
                if (navtype != 0 && Math.abs(navtype) <= 2)
                        cell.className += " nav";
                Calendar._add_evs(cell);
                cell.calendar = cal;
                cell.navtype = navtype;
                cell.innerHTML = "<div unselectable='on'>" + text + "</div>";
                return cell;
        };

        row = Calendar.createElement("tr", thead);
        var title_length = 6;
        (this.isPopup) && --title_length;
        (this.weekNumbers) && ++title_length;

        hh("?", 1, 400).ttip = Calendar._TT["INFO"];
        this.title = hh("", title_length, 300);
        this.title.className = "title";
        if (this.isPopup) {
                this.title.ttip = Calendar._TT["DRAG_TO_MOVE"];
                this.title.style.cursor = "move";
                hh("&#x00d7;", 1, 200).ttip = Calendar._TT["CLOSE"];
        }

        row = Calendar.createElement("tr", thead);
        row.className = "headrow";

        this._nav_py = hh("&#x00ab;", 1, -2);
        this._nav_py.ttip = Calendar._TT["PREV_YEAR"];

        this._nav_pm = hh("&#x2039;", 1, -1);
        this._nav_pm.ttip = Calendar._TT["PREV_MONTH"];

        this._nav_now = hh(Calendar._TT["TODAY"], this.weekNumbers ? 4 : 3, 0);
        this._nav_now.ttip = Calendar._TT["GO_TODAY"];

        this._nav_nm = hh("&#x203a;", 1, 1);
        this._nav_nm.ttip = Calendar._TT["NEXT_MONTH"];

        this._nav_ny = hh("&#x00bb;", 1, 2);
        this._nav_ny.ttip = Calendar._TT["NEXT_YEAR"];

        // day names
        row = Calendar.createElement("tr", thead);
        row.className = "daynames";
        if (this.weekNumbers) {
                cell = Calendar.createElement("td", row);
                cell.className = "name wn";
                cell.innerHTML = Calendar._TT["WK"];
        }
        for (var i = 7; i > 0; --i) {
                cell = Calendar.createElement("td", row);
                if (!i) {
                        cell.navtype = 100;
                        cell.calendar = this;
                        Calendar._add_evs(cell);
                }
        }
        this.firstdayname = (this.weekNumbers) ? row.firstChild.nextSibling : row.firstChild;
        this._displayWeekdays();

        var tbody = Calendar.createElement("tbody", table);
        this.tbody = tbody;

        for (i = 6; i > 0; --i) {
                row = Calendar.createElement("tr", tbody);
                if (this.weekNumbers) {
                        cell = Calendar.createElement("td", row);
                }
                for (var j = 7; j > 0; --j) {
                        cell = Calendar.createElement("td", row);
                        cell.calendar = this;
                        Calendar._add_evs(cell);
                }
        }

        if (this.showsTime) {
                row = Calendar.createElement("tr", tbody);
                row.className = "time";

                cell = Calendar.createElement("td", row);
                cell.className = "time";
                cell.colSpan = 2;
                cell.innerHTML = Calendar._TT["TIME"] || "&nbsp;";

                cell = Calendar.createElement("td", row);
                cell.className = "time";
                cell.colSpan = this.weekNumbers ? 4 : 3;

                (function(){
                        function makeTimePart(className, init, range_start, range_end) {
                                var part = Calendar.createElement("span", cell);
                                part.className = className;
                                part.innerHTML = init;
                                part.calendar = cal;
                                part.ttip = Calendar._TT["TIME_PART"];
                                part.navtype = 50;
                                part._range = [];
                                if (typeof range_start != "number")
                                        part._range = range_start;
                                else {
                                        for (var i = range_start; i <= range_end; ++i) {
                                                var txt;
                                                if (i < 10 && range_end >= 10) txt = '0' + i;
                                                else txt = '' + i;
                                                part._range[part._range.length] = txt;
                                        }
                                }
                                Calendar._add_evs(part);
                                return part;
                        };
                        var hrs = cal.date.getHours();
                        var mins = cal.date.getMinutes();
                        var t12 = !cal.time24;
                        var pm = (hrs > 12);
                        if (t12 && pm) hrs -= 12;
                        var H = makeTimePart("hour", hrs, t12 ? 1 : 0, t12 ? 12 : 23);
                        var span = Calendar.createElement("span", cell);
                        span.innerHTML = ":";
                        span.className = "colon";
                        var M = makeTimePart("minute", mins, 0, 59);
                        var AP = null;
                        cell = Calendar.createElement("td", row);
                        cell.className = "time";
                        cell.colSpan = 2;
                        if (t12)
                                AP = makeTimePart("ampm", pm ? "pm" : "am", ["am", "pm"]);
                        else
                                cell.innerHTML = "&nbsp;";

                        cal.onSetTime = function() {
                                var pm, hrs = this.date.getHours(),
                                        mins = this.date.getMinutes();
                                if (t12) {
                                        pm = (hrs >= 12);
                                        if (pm) hrs -= 12;
                                        if (hrs == 0) hrs = 12;
                                        AP.innerHTML = pm ? "pm" : "am";
                                }
                                H.innerHTML = (hrs < 10) ? ("0" + hrs) : hrs;
                                M.innerHTML = (mins < 10) ? ("0" + mins) : mins;
                        };

                        cal.onUpdateTime = function() {
                                var date = this.date;
                                var h = parseInt(H.innerHTML, 10);
                                if (t12) {
                                        if (/pm/i.test(AP.innerHTML) && h < 12)
                                                h += 12;
                                        else if (/am/i.test(AP.innerHTML) && h == 12)
                                                h = 0;
                                }
                                var d = date.getDate();
                                var m = date.getMonth();
                                var y = date.getFullYear();
                                date.setHours(h);
                                date.setMinutes(parseInt(M.innerHTML, 10));
                                date.setFullYear(y);
                                date.setMonth(m);
                                date.setDate(d);
                                this.dateClicked = false;
                                this.callHandler();
                        };
                })();
        } else {
                this.onSetTime = this.onUpdateTime = function() {};
        }

        var tfoot = Calendar.createElement("tfoot", table);

        row = Calendar.createElement("tr", tfoot);
        row.className = "footrow";

        cell = hh(Calendar._TT["SEL_DATE"], this.weekNumbers ? 8 : 7, 300);
        cell.className = "ttip";
        if (this.isPopup) {
                cell.ttip = Calendar._TT["DRAG_TO_MOVE"];
                cell.style.cursor = "move";
        }
        this.tooltips = cell;

        div = Calendar.createElement("div", this.element);
        this.monthsCombo = div;
        div.className = "combo";
        for (i = 0; i < Calendar._MN.length; ++i) {
                var mn = Calendar.createElement("div");
                mn.className = Calendar.is_ie ? "label-IEfix" : "label";
                mn.month = i;
                mn.innerHTML = Calendar._SMN[i];
                div.appendChild(mn);
        }

        div = Calendar.createElement("div", this.element);
        this.yearsCombo = div;
        div.className = "combo";
        for (i = 12; i > 0; --i) {
                var yr = Calendar.createElement("div");
                yr.className = Calendar.is_ie ? "label-IEfix" : "label";
                div.appendChild(yr);
        }

        this._init(this.firstDayOfWeek, this.date);
        parent.appendChild(this.element);
};

/** keyboard navigation, only for popup calendars */
Calendar._keyEvent = function(ev) {
        var cal = window._dynarch_popupCalendar;
        if (!cal || cal.multiple)
                return false;
        (Calendar.is_ie) && (ev = window.event);
        var act = (Calendar.is_ie || ev.type == "keypress"),
                K = ev.keyCode;
        if (ev.ctrlKey) {
                switch (K) {
                    case 37: // KEY left
                        act && Calendar.cellClick(cal._nav_pm);
                        break;
                    case 38: // KEY up
                        act && Calendar.cellClick(cal._nav_py);
                        break;
                    case 39: // KEY right
                        act && Calendar.cellClick(cal._nav_nm);
                        break;
                    case 40: // KEY down
                        act && Calendar.cellClick(cal._nav_ny);
                        break;
                    default:
                        return false;
                }
        } else switch (K) {
            case 32: // KEY space (now)
                Calendar.cellClick(cal._nav_now);
                break;
            case 27: // KEY esc
                act && cal.callCloseHandler();
                break;
            case 37: // KEY left
            case 38: // KEY up
            case 39: // KEY right
            case 40: // KEY down
                if (act) {
                        var prev, x, y, ne, el, step;
                        prev = K == 37 || K == 38;
                        step = (K == 37 || K == 39) ? 1 : 7;
                        function setVars() {
                                el = cal.currentDateEl;
                                var p = el.pos;
                                x = p & 15;
                                y = p >> 4;
                                ne = cal.ar_days[y][x];
                        };setVars();
                        function prevMonth() {
                                var date = new Date(cal.date);
                                date.setDate(date.getDate() - step);
                                cal.setDate(date);
                        };
                        function nextMonth() {
                                var date = new Date(cal.date);
                                date.setDate(date.getDate() + step);
                                cal.setDate(date);
                        };
                        while (1) {
                                switch (K) {
                                    case 37: // KEY left
                                        if (--x >= 0)
                                                ne = cal.ar_days[y][x];
                                        else {
                                                x = 6;
                                                K = 38;
                                                continue;
                                        }
                                        break;
                                    case 38: // KEY up
                                        if (--y >= 0)
                                                ne = cal.ar_days[y][x];
                                        else {
                                                prevMonth();
                                                setVars();
                                        }
                                        break;
                                    case 39: // KEY right
                                        if (++x < 7)
                                                ne = cal.ar_days[y][x];
                                        else {
                                                x = 0;
                                                K = 40;
                                                continue;
                                        }
                                        break;
                                    case 40: // KEY down
                                        if (++y < cal.ar_days.length)
                                                ne = cal.ar_days[y][x];
                                        else {
                                                nextMonth();
                                                setVars();
                                        }
                                        break;
                                }
                                break;
                        }
                        if (ne) {
                                if (!ne.disabled)
                                        Calendar.cellClick(ne);
                                else if (prev)
                                        prevMonth();
                                else
                                        nextMonth();
                        }
                }
                break;
            case 13: // KEY enter
                if (act)
                        Calendar.cellClick(cal.currentDateEl, ev);
                break;
            default:
                return false;
        }
        return Calendar.stopEvent(ev);
};

/**
 *  (RE)Initializes the calendar to the given date and firstDayOfWeek
 */
Calendar.prototype._init = function (firstDayOfWeek, date) {
        var today = new Date(),
                TY = today.getFullYear(),
                TM = today.getMonth(),
                TD = today.getDate();
        this.table.style.visibility = "hidden";
        var year = date.getFullYear();
        if (year < this.minYear) {
                year = this.minYear;
                date.setFullYear(year);
        } else if (year > this.maxYear) {
                year = this.maxYear;
                date.setFullYear(year);
        }
        this.firstDayOfWeek = firstDayOfWeek;
        this.date = new Date(date);
        var month = date.getMonth();
        var mday = date.getDate();
        var no_days = date.getMonthDays();

        // calendar voodoo for computing the first day that would actually be
        // displayed in the calendar, even if it's from the previous month.
        // WARNING: this is magic. ;-)
        date.setDate(1);
        var day1 = (date.getDay() - this.firstDayOfWeek) % 7;
        if (day1 < 0)
                day1 += 7;
        date.setDate(-day1);
        date.setDate(date.getDate() + 1);

        var row = this.tbody.firstChild;
        var MN = Calendar._SMN[month];
        var ar_days = this.ar_days = new Array();
        var weekend = Calendar._TT["WEEKEND"];
        var dates = this.multiple ? (this.datesCells = {}) : null;
        for (var i = 0; i < 6; ++i, row = row.nextSibling) {
                var cell = row.firstChild;
                if (this.weekNumbers) {
                        cell.className = "day wn";
                        cell.innerHTML = date.getWeekNumber();
                        cell = cell.nextSibling;
                }
                row.className = "daysrow";
                var hasdays = false, iday, dpos = ar_days[i] = [];
                for (var j = 0; j < 7; ++j, cell = cell.nextSibling, date.setDate(iday + 1)) {
                        iday = date.getDate();
                        var wday = date.getDay();
                        cell.className = "day";
                        cell.pos = i << 4 | j;
                        dpos[j] = cell;
                        var current_month = (date.getMonth() == month);
                        if (!current_month) {
                                if (this.showsOtherMonths) {
                                        cell.className += " othermonth";
                                        cell.otherMonth = true;
                                } else {
                                        cell.className = "emptycell";
                                        cell.innerHTML = "&nbsp;";
                                        cell.disabled = true;
                                        continue;
                                }
                        } else {
                                cell.otherMonth = false;
                                hasdays = true;
                        }
                        cell.disabled = false;
                        cell.innerHTML = this.getDateText ? this.getDateText(date, iday) : iday;
                        if (dates)
                                dates[date.print("%Y%m%d")] = cell;
                        if (this.getDateStatus) {
                                var status = this.getDateStatus(date, year, month, iday);
                                if (this.getDateToolTip) {
                                        var toolTip = this.getDateToolTip(date, year, month, iday);
                                        if (toolTip)
                                                cell.title = toolTip;
                                }
                                if (status === true) {
                                        cell.className += " disabled";
                                        cell.disabled = true;
                                } else {
                                        if (/disabled/i.test(status))
                                                cell.disabled = true;
                                        cell.className += " " + status;
                                }
                        }
                        if (!cell.disabled) {
                                cell.caldate = new Date(date);
                                cell.ttip = "_";
                                if (!this.multiple && current_month
                                    && iday == mday && this.hiliteToday) {
                                        cell.className += " selected";
                                        this.currentDateEl = cell;
                                }
                                if (date.getFullYear() == TY &&
                                    date.getMonth() == TM &&
                                    iday == TD) {
                                        cell.className += " today";
                                        cell.ttip += Calendar._TT["PART_TODAY"];
                                }
                                if (weekend.indexOf(wday.toString()) != -1)
                                        cell.className += cell.otherMonth ? " oweekend" : " weekend";
                        }
                }
                if (!(hasdays || this.showsOtherMonths))
                        row.className = "emptyrow";
        }
        this.title.innerHTML = Calendar._MN[month] + ", " + year;
        this.onSetTime();
        this.table.style.visibility = "visible";
        this._initMultipleDates();
        // PROFILE
        // this.tooltips.innerHTML = "Generated in " + ((new Date()) - today) + " ms";
};

Calendar.prototype._initMultipleDates = function() {
        if (this.multiple) {
                for (var i in this.multiple) {
                        var cell = this.datesCells[i];
                        var d = this.multiple[i];
                        if (!d)
                                continue;
                        if (cell)
                                cell.className += " selected";
                }
        }
};

Calendar.prototype._toggleMultipleDate = function(date) {
        if (this.multiple) {
                var ds = date.print("%Y%m%d");
                var cell = this.datesCells[ds];
                if (cell) {
                        var d = this.multiple[ds];
                        if (!d) {
                                Calendar.addClass(cell, "selected");
                                this.multiple[ds] = date;
                        } else {
                                Calendar.removeClass(cell, "selected");
                                delete this.multiple[ds];
                        }
                }
        }
};

Calendar.prototype.setDateToolTipHandler = function (unaryFunction) {
        this.getDateToolTip = unaryFunction;
};

/**
 *  Calls _init function above for going to a certain date (but only if the
 *  date is different than the currently selected one).
 */
Calendar.prototype.setDate = function (date) {
        if (!date.equalsTo(this.date)) {
                this._init(this.firstDayOfWeek, date);
        }
};

/**
 *  Refreshes the calendar.  Useful if the "disabledHandler" function is
 *  dynamic, meaning that the list of disabled date can change at runtime.
 *  Just * call this function if you think that the list of disabled dates
 *  should * change.
 */
Calendar.prototype.refresh = function () {
        this._init(this.firstDayOfWeek, this.date);
};

/** Modifies the "firstDayOfWeek" parameter (pass 0 for Synday, 1 for Monday, etc.). */
Calendar.prototype.setFirstDayOfWeek = function (firstDayOfWeek) {
        this._init(firstDayOfWeek, this.date);
        this._displayWeekdays();
};

/**
 *  Allows customization of what dates are enabled.  The "unaryFunction"
 *  parameter must be a function object that receives the date (as a JS Date
 *  object) and returns a boolean value.  If the returned value is true then
 *  the passed date will be marked as disabled.
 */
Calendar.prototype.setDateStatusHandler = Calendar.prototype.setDisabledHandler = function (unaryFunction) {
        this.getDateStatus = unaryFunction;
};

/** Customization of allowed year range for the calendar. */
Calendar.prototype.setRange = function (a, z) {
        this.minYear = a;
        this.maxYear = z;
};

/** Calls the first user handler (selectedHandler). */
Calendar.prototype.callHandler = function () {
        if (this.onSelected) {
                this.onSelected(this, this.date.print(this.dateFormat));
        }
};

/** Calls the second user handler (closeHandler). */
Calendar.prototype.callCloseHandler = function () {
        if (this.onClose) {
                this.onClose(this);
        }
        this.hideShowCovered();
};

/** Removes the calendar object from the DOM tree and destroys it. */
Calendar.prototype.destroy = function () {
        var el = this.element.parentNode;
        el.removeChild(this.element);
        Calendar._C = null;
        window._dynarch_popupCalendar = null;
};

/**
 *  Moves the calendar element to a different section in the DOM tree (changes
 *  its parent).
 */
Calendar.prototype.reparent = function (new_parent) {
        var el = this.element;
        el.parentNode.removeChild(el);
        new_parent.appendChild(el);
};

// This gets called when the user presses a mouse button anywhere in the
// document, if the calendar is shown.  If the click was outside the open
// calendar this function closes it.
Calendar._checkCalendar = function(ev) {
        var calendar = window._dynarch_popupCalendar;
        if (!calendar) {
                return false;
        }
        var el = Calendar.is_ie ? Calendar.getElement(ev) : Calendar.getTargetElement(ev);
        for (; el != null && el != calendar.element; el = el.parentNode);
        if (el == null) {
                // calls closeHandler which should hide the calendar.
                window._dynarch_popupCalendar.callCloseHandler();
                return Calendar.stopEvent(ev);
        }
};

/** Shows the calendar. */
Calendar.prototype.show = function () {
        var rows = this.table.getElementsByTagName("tr");
        for (var i = rows.length; i > 0;) {
                var row = rows[--i];
                Calendar.removeClass(row, "rowhilite");
                var cells = row.getElementsByTagName("td");
                for (var j = cells.length; j > 0;) {
                        var cell = cells[--j];
                        Calendar.removeClass(cell, "hilite");
                        Calendar.removeClass(cell, "active");
                }
        }
        this.element.style.display = "block";
        this.hidden = false;
        if (this.isPopup) {
                window._dynarch_popupCalendar = this;
                Calendar.addEvent(document, "keydown", Calendar._keyEvent);
                Calendar.addEvent(document, "keypress", Calendar._keyEvent);
                Calendar.addEvent(document, "mousedown", Calendar._checkCalendar);
        }
        this.hideShowCovered();
};

/**
 *  Hides the calendar.  Also removes any "hilite" from the class of any TD
 *  element.
 */
Calendar.prototype.hide = function () {
        if (this.isPopup) {
                Calendar.removeEvent(document, "keydown", Calendar._keyEvent);
                Calendar.removeEvent(document, "keypress", Calendar._keyEvent);
                Calendar.removeEvent(document, "mousedown", Calendar._checkCalendar);
        }
        this.element.style.display = "none";
        this.hidden = true;
        this.hideShowCovered();
};

/**
 *  Shows the calendar at a given absolute position (beware that, depending on
 *  the calendar element style -- position property -- this might be relative
 *  to the parent's containing rectangle).
 */
Calendar.prototype.showAt = function (x, y) {
        var s = this.element.style;
        s.left = x + "px";
        s.top = y + "px";
        this.show();
};

/** Shows the calendar near a given element. */
Calendar.prototype.showAtElement = function (el, opts) {
        var self = this;
        var p = Calendar.getAbsolutePos(el);
        if (!opts || typeof opts != "string") {
                this.showAt(p.x, p.y + el.offsetHeight);
                return true;
        }
        function fixPosition(box) {
                if (box.x < 0)
                        box.x = 0;
                if (box.y < 0)
                        box.y = 0;
                var cp = document.createElement("div");
                var s = cp.style;
                s.position = "absolute";
                s.right = s.bottom = s.width = s.height = "0px";
                document.body.appendChild(cp);
                var br = Calendar.getAbsolutePos(cp);
                document.body.removeChild(cp);
                if (Calendar.is_ie) {
                        br.y += document.body.scrollTop;
                        br.x += document.body.scrollLeft;
                } else {
                        br.y += window.scrollY;
                        br.x += window.scrollX;
                }
                var tmp = box.x + box.width - br.x;
                if (tmp > 0) box.x -= tmp;
                tmp = box.y + box.height - br.y;
                if (tmp > 0) box.y -= tmp;
        };
        this.element.style.display = "block";
        Calendar.continuation_for_the_fucking_khtml_browser = function() {
                var w = self.element.offsetWidth;
                var h = self.element.offsetHeight;
                self.element.style.display = "none";
                var valign = opts.substr(0, 1);
                var halign = "l";
                if (opts.length > 1) {
                        halign = opts.substr(1, 1);
                }
                // vertical alignment
                switch (valign) {
                    case "T": p.y -= h; break;
                    case "B": p.y += el.offsetHeight; break;
                    case "C": p.y += (el.offsetHeight - h) / 2; break;
                    case "t": p.y += el.offsetHeight - h; break;
                    case "b": break; // already there
                }
                // horizontal alignment
                switch (halign) {
                    case "L": p.x -= w; break;
                    case "R": p.x += el.offsetWidth; break;
                    case "C": p.x += (el.offsetWidth - w) / 2; break;
                    case "l": p.x += el.offsetWidth - w; break;
                    case "r": break; // already there
                }
                p.width = w;
                p.height = h + 40;
                self.monthsCombo.style.display = "none";
                fixPosition(p);
                self.showAt(p.x, p.y);
        };
        if (Calendar.is_khtml)
                setTimeout("Calendar.continuation_for_the_fucking_khtml_browser()", 10);
        else
                Calendar.continuation_for_the_fucking_khtml_browser();
};

/** Customizes the date format. */
Calendar.prototype.setDateFormat = function (str) {
        this.dateFormat = str;
};

/** Customizes the tooltip date format. */
Calendar.prototype.setTtDateFormat = function (str) {
        this.ttDateFormat = str;
};

/**
 *  Tries to identify the date represented in a string.  If successful it also
 *  calls this.setDate which moves the calendar to the given date.
 */
Calendar.prototype.parseDate = function(str, fmt) {
        if (!fmt)
                fmt = this.dateFormat;
        this.setDate(Date.parseDate(str, fmt));
};

Calendar.prototype.hideShowCovered = function () {
        if (!Calendar.is_ie && !Calendar.is_opera)
                return;
        function getVisib(obj){
                var value = obj.style.visibility;
                if (!value) {
                        if (document.defaultView && typeof (document.defaultView.getComputedStyle) == "function") { // Gecko, W3C
                                if (!Calendar.is_khtml)
                                        value = document.defaultView.
                                                getComputedStyle(obj, "").getPropertyValue("visibility");
                                else
                                        value = '';
                        } else if (obj.currentStyle) { // IE
                                value = obj.currentStyle.visibility;
                        } else
                                value = '';
                }
                return value;
        };

        var tags = new Array("applet", "iframe", "select");
        var el = this.element;

        var p = Calendar.getAbsolutePos(el);
        var EX1 = p.x;
        var EX2 = el.offsetWidth + EX1;
        var EY1 = p.y;
        var EY2 = el.offsetHeight + EY1;

        for (var k = tags.length; k > 0; ) {
                var ar = document.getElementsByTagName(tags[--k]);
                var cc = null;

                for (var i = ar.length; i > 0;) {
                        cc = ar[--i];

                        p = Calendar.getAbsolutePos(cc);
                        var CX1 = p.x;
                        var CX2 = cc.offsetWidth + CX1;
                        var CY1 = p.y;
                        var CY2 = cc.offsetHeight + CY1;

                        if (this.hidden || (CX1 > EX2) || (CX2 < EX1) || (CY1 > EY2) || (CY2 < EY1)) {
                                if (!cc.__msh_save_visibility) {
                                        cc.__msh_save_visibility = getVisib(cc);
                                }
                                cc.style.visibility = cc.__msh_save_visibility;
                        } else {
                                if (!cc.__msh_save_visibility) {
                                        cc.__msh_save_visibility = getVisib(cc);
                                }
                                cc.style.visibility = "hidden";
                        }
                }
        }
};

/** Internal function; it displays the bar with the names of the weekday. */
Calendar.prototype._displayWeekdays = function () {
        var fdow = this.firstDayOfWeek;
        var cell = this.firstdayname;
        var weekend = Calendar._TT["WEEKEND"];
        for (var i = 0; i < 7; ++i) {
                cell.className = "day name";
                var realday = (i + fdow) % 7;
                if (i) {
                        cell.ttip = Calendar._TT["DAY_FIRST"].replace("%s", Calendar._DN[realday]);
                        cell.navtype = 100;
                        cell.calendar = this;
                        cell.fdow = realday;
                        Calendar._add_evs(cell);
                }
                if (weekend.indexOf(realday.toString()) != -1) {
                        Calendar.addClass(cell, "weekend");
                }
                cell.innerHTML = Calendar._SDN[(i + fdow) % 7];
                cell = cell.nextSibling;
        }
};

/** Internal function.  Hides all combo boxes that might be displayed. */
Calendar.prototype._hideCombos = function () {
        this.monthsCombo.style.display = "none";
        this.yearsCombo.style.display = "none";
};

/** Internal function.  Starts dragging the element. */
Calendar.prototype._dragStart = function (ev) {
        if (this.dragging) {
                return;
        }
        this.dragging = true;
        var posX;
        var posY;
        if (Calendar.is_ie) {
                posY = window.event.clientY + document.body.scrollTop;
                posX = window.event.clientX + document.body.scrollLeft;
        } else {
                posY = ev.clientY + window.scrollY;
                posX = ev.clientX + window.scrollX;
        }
        var st = this.element.style;
        this.xOffs = posX - parseInt(st.left);
        this.yOffs = posY - parseInt(st.top);
        with (Calendar) {
                addEvent(document, "mousemove", calDragIt);
                addEvent(document, "mouseup", calDragEnd);
        }
};

// BEGIN: DATE OBJECT PATCHES

/** Adds the number of days array to the Date object. */
Date._MD = new Array(31,28,31,30,31,30,31,31,30,31,30,31);

/** Constants used for time computations */
Date.SECOND = 1000 /* milliseconds */;
Date.MINUTE = 60 * Date.SECOND;
Date.HOUR   = 60 * Date.MINUTE;
Date.DAY    = 24 * Date.HOUR;
Date.WEEK   =  7 * Date.DAY;

Date.parseDate = function(str, fmt) {
        var today = new Date();
        var y = 0;
        var m = -1;
        var d = 0;
        var a = str.split(/\W+/);
        var b = fmt.match(/%./g);
        var i = 0, j = 0;
        var hr = 0;
        var min = 0;
        for (i = 0; i < a.length; ++i) {
                if (!a[i])
                        continue;
                switch (b[i]) {
                    case "%d":
                    case "%e":
                        d = parseInt(a[i], 10);
                        break;

                    case "%m":
                        m = parseInt(a[i], 10) - 1;
                        break;

                    case "%Y":
                    case "%y":
                        y = parseInt(a[i], 10);
                        (y < 100) && (y += (y > 29) ? 1900 : 2000);
                        break;

                    case "%b":
                    case "%B":
                        for (j = 0; j < 12; ++j) {
                                if (Calendar._MN[j].substr(0, a[i].length).toLowerCase() == a[i].toLowerCase()) { m = j; break; }
                        }
                        break;

                    case "%H":
                    case "%I":
                    case "%k":
                    case "%l":
                        hr = parseInt(a[i], 10);
                        break;

                    case "%P":
                    case "%p":
                        if (/pm/i.test(a[i]) && hr < 12)
                                hr += 12;
                        else if (/am/i.test(a[i]) && hr >= 12)
                                hr -= 12;
                        break;

                    case "%M":
                        min = parseInt(a[i], 10);
                        break;
                }
        }
        if (isNaN(y)) y = today.getFullYear();
        if (isNaN(m)) m = today.getMonth();
        if (isNaN(d)) d = today.getDate();
        if (isNaN(hr)) hr = today.getHours();
        if (isNaN(min)) min = today.getMinutes();
        if (y != 0 && m != -1 && d != 0)
                return new Date(y, m, d, hr, min, 0);
        y = 0; m = -1; d = 0;
        for (i = 0; i < a.length; ++i) {
                if (a[i].search(/[a-zA-Z]+/) != -1) {
                        var t = -1;
                        for (j = 0; j < 12; ++j) {
                                if (Calendar._MN[j].substr(0, a[i].length).toLowerCase() == a[i].toLowerCase()) { t = j; break; }
                        }
                        if (t != -1) {
                                if (m != -1) {
                                        d = m+1;
                                }
                                m = t;
                        }
                } else if (parseInt(a[i], 10) <= 12 && m == -1) {
                        m = a[i]-1;
                } else if (parseInt(a[i], 10) > 31 && y == 0) {
                        y = parseInt(a[i], 10);
                        (y < 100) && (y += (y > 29) ? 1900 : 2000);
                } else if (d == 0) {
                        d = a[i];
                }
        }
        if (y == 0)
                y = today.getFullYear();
        if (m != -1 && d != 0)
                return new Date(y, m, d, hr, min, 0);
        return today;
};

/** Returns the number of days in the current month */
Date.prototype.getMonthDays = function(month) {
        var year = this.getFullYear();
        if (typeof month == "undefined") {
                month = this.getMonth();
        }
        if (((0 == (year%4)) && ( (0 != (year%100)) || (0 == (year%400)))) && month == 1) {
                return 29;
        } else {
                return Date._MD[month];
        }
};

/** Returns the number of day in the year. */
Date.prototype.getDayOfYear = function() {
        var now = new Date(this.getFullYear(), this.getMonth(), this.getDate(), 0, 0, 0);
        var then = new Date(this.getFullYear(), 0, 0, 0, 0, 0);
        var time = now - then;
        return Math.floor(time / Date.DAY);
};

/** Returns the number of the week in year, as defined in ISO 8601. */
Date.prototype.getWeekNumber = function() {
        var d = new Date(this.getFullYear(), this.getMonth(), this.getDate(), 0, 0, 0);
        var DoW = d.getDay();
        d.setDate(d.getDate() - (DoW + 6) % 7 + 3); // Nearest Thu
        var ms = d.valueOf(); // GMT
        d.setMonth(0);
        d.setDate(4); // Thu in Week 1
        return Math.round((ms - d.valueOf()) / (7 * 864e5)) + 1;
};

/** Checks date and time equality */
Date.prototype.equalsTo = function(date) {
        return ((this.getFullYear() == date.getFullYear()) &&
                (this.getMonth() == date.getMonth()) &&
                (this.getDate() == date.getDate()) &&
                (this.getHours() == date.getHours()) &&
                (this.getMinutes() == date.getMinutes()));
};

/** Set only the year, month, date parts (keep existing time) */
Date.prototype.setDateOnly = function(date) {
        var tmp = new Date(date);
        this.setDate(1);
        this.setFullYear(tmp.getFullYear());
        this.setMonth(tmp.getMonth());
        this.setDate(tmp.getDate());
};

/** Prints the date in a string according to the given format. */
Date.prototype.print = function (str) {
        var m = this.getMonth();
        var d = this.getDate();
        var y = this.getFullYear();
        var wn = this.getWeekNumber();
        var w = this.getDay();
        var s = {};
        var hr = this.getHours();
        var pm = (hr >= 12);
        var ir = (pm) ? (hr - 12) : hr;
        var dy = this.getDayOfYear();
        if (ir == 0)
                ir = 12;
        var min = this.getMinutes();
        var sec = this.getSeconds();
        s["%a"] = Calendar._SDN[w]; // abbreviated weekday name [FIXME: I18N]
        s["%A"] = Calendar._DN[w]; // full weekday name
        s["%b"] = Calendar._SMN[m]; // abbreviated month name [FIXME: I18N]
        s["%B"] = Calendar._MN[m]; // full month name
        // FIXME: %c : preferred date and time representation for the current locale
        s["%C"] = 1 + Math.floor(y / 100); // the century number
        s["%d"] = (d < 10) ? ("0" + d) : d; // the day of the month (range 01 to 31)
        s["%e"] = d; // the day of the month (range 1 to 31)
        // FIXME: %D : american date style: %m/%d/%y
        // FIXME: %E, %F, %G, %g, %h (man strftime)
        s["%H"] = (hr < 10) ? ("0" + hr) : hr; // hour, range 00 to 23 (24h format)
        s["%I"] = (ir < 10) ? ("0" + ir) : ir; // hour, range 01 to 12 (12h format)
        s["%j"] = (dy < 100) ? ((dy < 10) ? ("00" + dy) : ("0" + dy)) : dy; // day of the year (range 001 to 366)
        s["%k"] = hr;           // hour, range 0 to 23 (24h format)
        s["%l"] = ir;           // hour, range 1 to 12 (12h format)
        s["%m"] = (m < 9) ? ("0" + (1+m)) : (1+m); // month, range 01 to 12
        s["%M"] = (min < 10) ? ("0" + min) : min; // minute, range 00 to 59
        s["%n"] = "\n";         // a newline character
        s["%p"] = pm ? "PM" : "AM";
        s["%P"] = pm ? "pm" : "am";
        // FIXME: %r : the time in am/pm notation %I:%M:%S %p
        // FIXME: %R : the time in 24-hour notation %H:%M
        s["%s"] = Math.floor(this.getTime() / 1000);
        s["%S"] = (sec < 10) ? ("0" + sec) : sec; // seconds, range 00 to 59
        s["%t"] = "\t";         // a tab character
        // FIXME: %T : the time in 24-hour notation (%H:%M:%S)
        s["%U"] = s["%W"] = s["%V"] = (wn < 10) ? ("0" + wn) : wn;
        s["%u"] = w + 1;        // the day of the week (range 1 to 7, 1 = MON)
        s["%w"] = w;            // the day of the week (range 0 to 6, 0 = SUN)
        // FIXME: %x : preferred date representation for the current locale without the time
        // FIXME: %X : preferred time representation for the current locale without the date
        s["%y"] = ('' + y).substr(2, 2); // year without the century (range 00 to 99)
        s["%Y"] = y;            // year with the century
        s["%%"] = "%";          // a literal '%' character

        var re = /%./g;
        if (!Calendar.is_ie5 && !Calendar.is_khtml)
                return str.replace(re, function (par) { return s[par] || par; });

        var a = str.match(re);
        for (var i = 0; i < a.length; i++) {
                var tmp = s[a[i]];
                if (tmp) {
                        re = new RegExp(a[i], 'g');
                        str = str.replace(re, tmp);
                }
        }

        return str;
};

Date.prototype.__msh_oldSetFullYear = Date.prototype.setFullYear;
Date.prototype.setFullYear = function(y) {
        var d = new Date(this);
        d.__msh_oldSetFullYear(y);
        if (d.getMonth() != this.getMonth())
                this.setDate(28);
        this.__msh_oldSetFullYear(y);
};

// END: DATE OBJECT PATCHES


// global object that remembers the calendar
window._dynarch_popupCalendar = null;